Improve resilience to cacheManager: EOF

[robdimsdale]

When we run ctrl+c the paketo buildpacks integration tests we sometimes see the following error on re-runs:

=== RUN   TestIntegration
    init_test.go:68: 
        Unexpected error:
            <*errors.errorString | 0xc000441a90>: 
            failed to open cacheManager: EOF
            {
                s: "failed to open cacheManager: EOF",
            }
        occurred
--- FAIL: TestIntegration (0.00s)
FAIL
FAIL	github.com/paketo-buildpacks/node-engine/integration	0.009s
FAIL
** GO Test Failed with index.docker.io/paketobuildpacks/builder:buildpackless-base**

We typically resolve this with:

rm -rf $HOME/.freezer-cache

This works, but it's not a great UX. Can we make this library more resilient to an empty cache manager?

Example of community member running into it: see paketo-buildpacks/node-engine#630